The japanese public see the ps4 as a western centric console and so do their devs. Look at sony's 1st party games, killzone, infamous, etc all western centric games. .
Despite what people may think Japan is Nintendo's territory. Nintendo have Dragon Quest from Square Enix and Monster Hunter from Capcom as Nintendo exclusives, which are easily the biggest Japanese system sellers. The third biggest franchise would be Dynasty Warriors and now there is a co-development of Zelda Warriors with Tecmo Koei. Not to mention other co-developments/cross overs, Namco Bandia developing Smash Bros with Nintendo, Atlus doing FE x SMT, Platinum Bayonetta 2 and The W101, Sega and Sonic games.
Japan is fully behind Nintendo. All jap support will go where ever MH and DQ go.
Sony as a whole has become a dead brand in Japan. Japanese rather buy Korean TVs/electronics than Sony products which is a feat for such a xenophobic nations as Japan, that should tell you how popular Sony is there.
Japan's largest carrier is now using the iPhone on it's network to replace Sony as it's main brand of phones after ten years of Sony domination as the biggest mobile provider. Samsung's has also taken 2nd place in the Japan mobile market as and knocked Sony into third and free falling fast. Its once Mobile monopoly is finished.
That's how much Sony is doomed. Japan would rather have a Korean product than a Japanese product. But then Samsung and LG hired all the Japanese engineers Sony fired over the last 10 years so karma is a fucking bitch.